sway: screenshots, polkit floating, flatpak dark theme

Screenshots
- Swap xfce4-screenshooter for flameshot + grim/slurp/jq; xfce4 used
  the X11 selection so clipboard didn't round-trip to Wayland clients.
  Print invokes flameshot's editor; Shift/Alt+Print are quick
  grim-based captures via a small wrapper script. Flameshot is now
  autostarted so the first capture isn't slow.

Polkit
- Add for_window rules so the xfce-polkit dialog (and any other polkit
  agent) always opens floating.

Flatpak dark theme
- Write /etc/flatpak/overrides/global with GTK_THEME=Yaru-Blue-dark for
  legacy GTK apps, plus a sway-portals.conf so the Settings portal is
  served by xdg-desktop-portal-gtk (wlr doesn't implement it). That
  lets libadwaita apps see color-scheme=prefer-dark.

cleanup-sway: track the new package set.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

dotfiles/desktop/.config/sway/config

@@ -62,6 +62,11 @@ gaps outer 4
 smart_gaps on
 smart_borders on
 
+# Window rules
+for_window [app_id="(?i)polkit"] floating enable
+for_window [class="(?i)polkit"] floating enable
+for_window [title="^Authentication Required"] floating enable
+
 # Autostart — XDG and session services
 exec dex --autostart --environment sway
 exec gnome-keyring-daemon --start --components=secrets
@@ -85,6 +90,7 @@ exec /usr/libexec/xfce-polkit
 exec nm-applet
 exec blueman-applet
 exec udiskie
+exec flameshot
 
 # Clipboard manager (Wayland-native)
 exec wl-paste --type text  --watch cliphist store
@@ -125,10 +131,13 @@ bindsym $mod+Shift+x exec ~/.config/sway/scripts/lockscreen
 # Kill focused window
 bindsym $mod+Shift+q kill
 
-# Screenshot (xfce4-screenshooter via xdg-desktop-portal-wlr)
-bindsym Print exec xfce4-screenshooter
-bindsym Shift+Print exec xfce4-screenshooter -r
-bindsym Alt+Print exec xfce4-screenshooter -w
+# Screenshot
+#   Print        → flameshot GUI (annotations, save + clipboard via portal)
+#   Shift+Print  → grim+slurp region → clipboard
+#   Alt+Print    → grim focused output → clipboard
+bindsym Print exec flameshot gui --path "$HOME/Pictures/Screenshots" --clipboard
+bindsym Shift+Print exec ~/.config/sway/scripts/screenshot region
+bindsym Alt+Print exec ~/.config/sway/scripts/screenshot output
 
 # Focus
 bindsym $mod+$left focus left

dotfiles/desktop/.config/sway/scripts/screenshot

@@ -0,0 +1,40 @@
+#!/bin/sh
+# Quick screenshot helpers for sway. Captures via grim, saves to disk and
+# also copies to the Wayland clipboard. Use the flameshot binding for
+# annotations / fancy capture.
+#
+# Usage: screenshot {full|region|output|window}
+
+set -eu
+
+mode="${1:-full}"
+dir="$HOME/Pictures/Screenshots"
+mkdir -p "$dir"
+file="$dir/$(date +%Y%m%d_%H%M%S).png"
+
+case "$mode" in
+  full)
+    grim "$file"
+    ;;
+  region)
+    grim -g "$(slurp)" "$file"
+    ;;
+  output)
+    out=$(swaymsg -t get_outputs --raw \
+            | jq -r '.[] | select(.focused) | .name')
+    grim -o "$out" "$file"
+    ;;
+  window)
+    geom=$(swaymsg -t get_tree \
+             | jq -r '.. | select(.focused? == true)
+                      | "\(.rect.x),\(.rect.y) \(.rect.width)x\(.rect.height)"')
+    grim -g "$geom" "$file"
+    ;;
+  *)
+    printf 'Usage: %s {full|region|output|window}\n' "$0" >&2
+    exit 1
+    ;;
+esac
+
+wl-copy < "$file"
+notify-send "Screenshot saved" "$file" -i image-x-generic >/dev/null 2>&1 || true